Not only in a race the right spark at the right moment can determine victory or defeat.
For double ignition motorcycles, you need two pieces of 50020 and two pieces of DCPR8EKC (50020: thread diameter 14mm / DCPR8EKC: thread diameter 12mm)
O-ring 52x2 for throttle housing
Compare BMW part...
Spark plug cover for double spark ignition
BMW...
This ribbed v-belt Contitech 4PK611 (also called multi-rib...